Avoid duplicate loads on creating item adjustments

This reduces a source of duplicate records loads that can lead do deadlocks and identity problems.

We oversaw this one on the deduploads optimization branch.

After merging I'm gonna squash this commit into the deduploads one on the next rebase.
Feel free to submit a PR enabling coverage reports to work during CI runs.  I'm not sure how to do it, and don't have the time to learn it right now otherwise I would.